Rod-packing.



T. A. JOHNSTON.

ROD PACKING.

APPLICATION IILED JULY 12, 1909.

Patented Mar. 29,1910.

Queen;

THOMAS A. JOHNSTON, OF CHADRON, NEBRASKA, ASSIGNOR OF ONE-FOURTH TOTHOMAS L. FINLEY, OF LONG PINE, NEBRASKA.

ROD-PACKING.

Specification of Letters Patent. 7 Patented Mar. 29, 1910.

Application filed July 12, 1909. Serial No. 507,123.

To aZLwho'm it may concern:

Be it known that I, THOMAS A. JOHNSTON, a citizen of the United States,residing at Ghadron, in the county of Dawes and State of Nebraska, haveinvented certain new and useful Improvements in Rod-Packing, of whichthe following is a specification.

This invention relates to rod packing for nonvibrating rods, and has.for its object to provide an improved construction for holding thepacking and supporting the rod, and the arrangement is particularlysuitable for use with injectors or under other conditions where packingis desirable, but where no lateral vibration of the rod exists.

The invention includes the use of shot packing which is compressedagainst the rod by means of a screw plug and a spring follower, and inwhich the packing can be easily renewed without removing the casing fromthe device to which it is applied.

The invention is illustrated in the accompanying drawing in which Figure1 is a longitudinal section; Fig.2 is a cross section on the line 2-2 ofFig. 1.

Referring specifically to the drawings, 6 indicates a body or casingwhich may be applied to the valve or other structure by any suitablemeans. I have shown a reduced neck 7 at the inner end of said body, toscrew into a threaded hole formed to receive it inthe structure to whichthe valve rod or other rod is to be applied. The body 6 is provided witha globular chamber extending around the rod or valve stem 8, and thischamber is filled with shot packing 9 which is compressed by means of ascrew plug 10 bearing on a coiled spring 11 behind a follower 12 whichholds the packing under pressure at all times; and by screwing in theplug the pressure may be increased as desired. The purpose of thepacking is to form a steam tight joint, and when under pressure the shotwill assume a proper positionto form a 'tightjoint with the rod, in amanner similar to that disclosed in my former patents, Nos. 779,480,872,132 and 894,739. Graphite, soft metal, or other material may besubstituted for the shot packing, or may be mixed therewith. The screw10 screws into a nipple 13 extending laterally from the body of theland.

Near the outer end the ody is recessed as indicated at 14 around therod, and said recess has one or more outlet openings 15, and at itsextremity the bore of the body is threaded at 16 to receive the screw 2of the rod .8, whereby the valve or other part is operated by turningthe rod, conveniently by means of a crank wheel 17. The space 14 is toallow the escape or dislodgment of any matter which may work out fromthe packing around the rod, so that dirt, condensation or other foreignmatter which may be forced out from the packing will not get back intothe thread. This prevents bindlng of the rod, or rusting or other injuryto the threads, which, when it occurs, makes the rod stick, or diflicultto turn.

It will be seen that the packing may be removed or other structure whichis applied,-

by simply taking out the screw plug 10. The shot packing is particularlysusceptible of convenient renewal under such condltions. The deviceprovides a very simple form of packing for nonvibrating rods such asvalve stems and the like.

I claim:

1. A rod packing comprising a body through which the rod extends, andprovided with an inner chamber with packing therein around the rod, andalso with an outer chamber around the rod, said outer chamber having anopening in the wall thereof.

2. A rod packing comprising a body having a bore and inner and outerchambers through which the rod extends, the bore being threaded at itsouter end to receive corresponding threads on the rod, the inner chamberhaving compressible packing therein and means to compress the same, andthe outer chamber having an opening in the wall thereof.

In testimony whereof, I afiix my signature in presence of two witnesses.

THOMAS A. JOHNSTON.

Witnesses:

B. F. PITMAN, H. J. SCHLEY.

